Theophylline derivatives

ABSTRACT

Theophylline compounds of the formula,   WHEREIN X is oxycarbonyl, carboxyl or carbonyl and R is a lower alkyl group containing from 1 to 5 carbon atoms which have excellent coronary vasodilating effects are produced by reacting a compound having the formula   WHEREIN A is hydroxyl, or a carboxyl containing group or a halogenide, acid anhydride or ester thereof, with a compound having the formula   WHEREIN B is hydrogen, hydroxyl, or a carboxyl containing group or a halogenide, acid anhydride or ester thereof, and R is defined as before.

United States Patent Takahashi et al.

[ THEOPHYLLINE DERIVATIVES [75] Inventors: Hidehiko Takahashi, Tokyo; Yoshio Suzuki, MisatoMachi; Tuyoshi Kinoshita, Koshigaya. all of Japan [73] Assignee: Nippon Chemiphar Co., Ltd.,

Tokyo, Japan [22] Filed: July 13, 1973 [Zl] Appl. No.: 378,806

[30] Foreign Application Priority Data July 13. 1972 Japan 47-70294 [52] U.S. Cl 260/256; 424/253 [51] Int. Cl i i C07d 57/48 [58] Field of Search 260/256 [56] References Cited UNITED STATES PATENTS 3 399 l95 8/1968 Stachel et al. 260/256 3,813,394 5/l974 Tensho et al. 260/252 Primary ExaminerDonald G Daus Assistant Examiner-Anne Marie T. Tighe Attorney, Agent, or FirmOblon, Fisher, Spivak, McClelland & Maier [57] ABSTRACT Theophylline compounds of the formula [451 July 22, 1975 N N Y I CH; N O l CHQCHQCH A wherein A is hydroxyl. or a carboxyl containing group or a halogenide. acid anhydride or ester thereof, with a compound having the formula wherein B is hydrogen hydroxyl. or a carboxyl con' taining group or a halogenide. acid anhydride or ester thereof, and R is defined as before.

5 Claims, No Drawings 1 2 THEOPHYLLINE DERIVATIVES 3:4 BACKGROUND OF THE INVENTION 1 1. Field of the Invention This invention relates to theophylline derivatives and a process for producing said derivatives. More particularly, this invention is concerned with theophylline derivatives having the formula (I):

wherein A is hydroxyl, or a carboxyl containing group g m or a halogenide, acid anhydride or ester thereof, with v a compound of the formula. C, r

f v' A j: v y \H CH \1/ t i wherein R is lower alkyl containing from I to 5 carbon ing effects and is, therefore, effective in the treatment of angina pectoris. However, it also stimulates the heart rate and enhances myocardial oxygen consumption, which results in an insufficient supply of oxygen to the heart.

A need, therefore. exists for a therapeutic agent which possesses satisfactory coronary vasodilating effects while at the same time not acting as a heart stimulant to diminish the vital supply of oxygen to heart tissues.

SUMMARY OF THE INVENTION Accordingly, one object of this invention is to provide theophylline derivatives having the formula (I) which possess superior coronary vasodilating effects.

Another object of this invention is to provide an industrially advantageous process for the synthesis of theophylline derivatives represented by formula (I).

Briefly, these objects and other objects of this invention as hereinafter will become more readily apparent can be attained by a process for preparing theophylline compounds having the formula wherein B is hydrogen, hydroxyl, or a carbonyl containing groups, or a halogenide, acid anhydride or ester thereof and R is defined as before.

DESCRIPTION OF THE PREFERRED EMBODIMENTS In conducting the process of this invention. compound (II) is reacted with trialkoxy arene compound (III) in an inert solvent under reflux conditions. It has also been found that the reaction can be performed in the presence of a condensing agent such as a trialkyl amine. Although the time required for the reaction to go to completion will vary according to the reactivity of the compounds (II) and (Ill) and the reaction temperature, normally from 2 to 10 hours will be sufficient Compounds II and III which are the starting materials for the reaction of the invention contain reactive func tional groups A and B respectively. Suitable functional groups for the group A include hydroxyl, or carboxyl containing groups of halogenides, acid anhydrides or esters thereof. Suitable functional groups for the group B include hydrogen, hydroxyl, carboxyl containing groups or halogenides, acid anhydrides or esters thereof. Suitable R groups in compound I" include methyl, ethyl, propyl, isopropyl and the like.

In order to determine the physiological effects of the theophylline derivatives on coronary circulation, the effects of the compounds were compared to the effects exhibited by theophylline and nitroglycerin in thoractomized dogs. As shown in Table l, the coronary sinus out 5 flow after the administration of the theophylline com- 0 s pounds was found to be as high as that of theophylline, 0 indicating that the compounds of this invention exhibit i l i (m as strong a coronary vasodilating effect as the comparative compounds. As can be seen from Tables I] and Ill. administration of theophylline derivatives. particularly TG-3. resulted in relatively low myocardial oxygen comsumption with a reduced heart rate, in contrast to the effect exhibited by theophylline. The data obtained indicates that the theophylline compounds of this in vention exhibit excellent coronary vasodilating effects while at the same time exhibiting lesser adverse effects on the myocardium in comparison to theophylline.

Table I Coronary Sinus Out Flow in Dogs (ml/min) Dose No. of Initial C g 9%) of basal values Compounds (mg/kg) animals basal 0 I 5 l0 I5 20 25 30 values (min) 2.0 3 42.0 +6.5 +7.0 +l0.0 +l0.5 +8.0 +6.0 +2.0 0 TG-] 6.0 3 44.0 +32.0 +24 0 +l8.0 +181) +185 +205 +2().0 +1 6.0 20.0 3 42.5 +77.5 +88 5 +451) +395 +3 [.0 +220 +I6.5 +l5.0

Having generally described the invention, a more complete understanding can be obtained by reference to certain specific examples, which are included for purposes of illustration only and are not intended to be limiting unless otherwise specified.

EXAMPLE l 7-[-y-( 3 ,4,5-Trimethoxybenzyloxy)-n-propyl theophylline A 5.2 g (0.023 moles) quantity of 3,4,5- trimethoxybenzoyl chloride, 4.8 g (0.02 moles) of 7-(yhydroxy-n-propyl) theophylline and 4.0 g (0.04 moles) of triethylamine were dissolved in ISO ml of anhydrous benzene. The resulting solution was refluxed for 8 hours. The heated reaction mixture was filtered, and washed with a saturated saline solution, a saturated sodium bicarbonate solution and then a saturated saline- Elemental Analysis: C H N O C H N Calculated (k1 55.55 5.59 [2.96 Found 55.45 5.50 l2.67

EXAMPLE 2 7-['y-( 3,4,5-Trimethoxyphenoxycarbonyl)-npropyl]theophylline An 8.0 g (0.03 moles) amount of 7-(y-carboxy-npropyl)-theophylline, 5.5 g (0.03 moles) of 3,4,5- trimethoxyphenol and 0.03 moles of phosphorus oxychloride were dissolved in 200 mol of anhydrous benzene. The resulting solution was refluxed for hours. After cooling, the reaction mixture was washed with a saturated sodium bicarbonate solution and a saturated saline solution. The washed solution was dried over anhydrous sodium sulfate and the solvent was evaporated therefrom. By this procedure was obtained 9.2 g of a white crystalline material. Recrystallization of the material from benzene afforded 8.5 g (66% of yield) of a white crystalline product having a metling point of 154-l56C.

EXAMPLE 3 7-['y-(2,3,4-Trimethoxybenzoyl )-n-propyl]- theophylline An g (0.03 moles) amount of 7-(y-carboxy-npropyl)-theophylline and 3.3 g (0.02 moles) of I23- trimethoxybenzene were dissolved in 12.6 g (0.06 moles) of trifluoroacetic anhydride. The resulting solution was refluxed for 2.5 hours. After cooling, sodium bicarbonate was added to the reaction mixture in a quantity which gave a final pH of 7.0. After extracting the solution with benzene. the extract obtained was washed with a saturated sodium bicarbonate solution and a saturated saline solution. The washed solution was dried over anhydrous sodium sulfate and the solvent was evaporated therefrom. An 8.9 g amount of a reddish oily substance was obtained. This oily substance was recrystallized from isopropyl ether and further recrystallization from benzene-isopropyl ether afforded 5.l g (41% of yield) of pale yellow needles of a compound having a melting point of l l9-l 20C.

Elemental Analysis: C H N OQ;

C H N Calculated (3%) 57.68 5.8l 13.46 Found ('75) 57.54 5.58 l3.4l

Having now fully described the invention, it will be apparent to one of ordinary skill in the art that many changes and modifications can be made thereto with departing from the spirit or scope of the invention as set forth herein.

What is claimed as new and intended to be covered by Letters Patent is:

1. A theophylline compound of the formula 

1. A THEOPHYLLINE COMPOUND OF THE FORMULA
 2. A theophylline compound of claim 1, wherein R is a methyl group.
 3. A theophylline compound of claim 1, which is 7-( gamma -(2, 3,4-trimethoxybenzoyl)-n-propyl) theophylline.
 4. A theophylline compound of claim 1, which is 7-( gamma -(3, 4,5-trimethoxyphenoxycarbonyl)-n-propyl) theophylline.
 5. A theophylline compound of claim 1, which is 7-( gamma -(3, 4,5-trimethoxybenzoyloxY)-n-propyl) theophylline. 